import axios from 'axios'
import { baseUrl } from '@/config/env'

let cancel ,promiseArr = {}
const CancelToken = axios.CancelToken;
//请求拦截器
axios.interceptors.request.use(config => {
    //发起请求时，取消掉当前正在进行的相同请求
    if (promiseArr[config.url]) {
        promiseArr[config.url]('操作取消')
        promiseArr[config.url] = cancel
    } else {
        promiseArr[config.url] = cancel
    }
      return config
}, error => {
    return Promise.reject(error)
})

//响应拦截器即异常处理
axios.interceptors.response.use(response => {
    return response
}, err => {
    if (err && err.response) {
      switch (err.response.status) {
        case 400:
          err.message = '错误请求'
          break;
        case 401:
          err.message = '未授权，请重新登录'
          break;
        case 403:
          err.message = '拒绝访问'
          break;
        case 404:
          err.message = '请求错误,未找到该资源'
          break;
        case 405:
          err.message = '请求方法未允许'
          break;
        case 408:
          err.message = '请求超时'
          break;
        case 500:
          err.message = '服务器端出错'
          break;
        case 501:
          err.message = '网络未实现'
          break;
        case 502:
          err.message = '网络错误'
          break;
        case 503:
          err.message = '服务不可用'
          break;
        case 504:
          err.message = '网络超时'
          break;
        case 505:
          err.message = 'http版本不支持该请求'
          break;
        default:
          err.message = `连接错误${err.response.status}`
      }
    } else {
      err.message = "连接到服务器失败"
    }
    // message.err(err.message)
    //   return Promise.resolve(err.response)
})

// axios.defaults.baseURL = '/api'
let _url = 'http://localhost:3000'
axios.defaults.withCredentials = true //请求时带上cookie，解决因跨越造成session丢失


//设置默认请求头
axios.defaults.headers = {
    'X-Requested-With': 'XMLHttpRequest',
    'Access-Control-Allow-Origin': '*'
}
axios.defaults.timeout = 10000

export default {
    fetchGet: (url, params = {}) => {
        return new Promise((resolve, reject) => {
            axios.get(_url + url, {params}).then(res => {
                // console.log(res.data)
                resolve(res.data)
            }).catch(error => {
                reject(error)
            })
        })
    },
    fetchPost: (url, params = {}) => {
        return new Promise((resolve, reject) => {
            axios.post(_url + url, params).then(res => {
                resolve(res.data)
            }).catch(error => {
                reject(error)
            })
        })
    },
    fetchUpload: (url, formdata) => {
        return new Promise((resolve, response) => {
            axios({
                url: _url + url,
                method: 'POST',
                data: formdata,
                headers: { 'Content-Type': 'multipart/form-data' },
            }).then((res) => {
                resolve(res.data)
            }).catch(error => {
                reject(error)
            })
        })
    }
}